package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
/**
 * 执行UPDATE语句
 */
public class JDBCDemo3 {
    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection connection= DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root"
        );

        Statement statement = connection.createStatement();

        /*
        UPDATE userinfo
        SET nickname='小名'
        WHERE username='无名氏'
         */
        String sql="UPDATE userinfo\n" +
                "        SET nickname='小名'\n" +
                "        WHERE username='无名氏'";
        int num = statement.executeUpdate(sql);
        if(num>0){
            System.out.println("修改成功");
        }else {
            System.out.println("修改失败");
        }

        connection.close();

    }
}
